C. State whether the following statements are true or false. 1. The molten wax solidifies back to make solid wax. T 2. Evaporation is a chemical change. T 3. Burning of incense stick is a reversible change.f 4. When we freeze water, it changes to ice. 5. Stretching of rubber band is a chemical change. D. Match the following columns. Column A 1. Expansion 2. Contraction 3. Baking of cake 4. Clay modelling 5. Burning of a piece of wood a. Column B Chemical change b. Physical and reversible c. Physical but irreversible d. Caused by heating and reversible Caused by cooling and reversible e.
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photosynthesis is the process in which green plants and some other organisms use sunlight to synthesize nutrients from carbon dioxide and water. photosynthesis in plants generally involve the green pigment chlorophyll and generates oxygen as by-product
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Chemical changes occur when a substance combines with another to from a new substance , called chemical synthesis or , alternatively , chemical decomposition into two or more different substance . These processes are called chemical reaction and , in general, are not reversible except by further chemical reactions.
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